linux-kernel - Re: [RFC PATCH v1 4/4] arm64: Mark stack trace as unreliable if kretprobed functions are present

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Message-ID: <20210401172337.GN4758@sirena.org.uk>
Date:   Thu, 1 Apr 2021 18:23:37 +0100
From:   Mark Brown <broonie@...nel.org>
To:     madvenka@...ux.microsoft.com
Cc:     mark.rutland@....com, jpoimboe@...hat.com, jthierry@...hat.com,
        catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 4/4] arm64: Mark stack trace as unreliable if
 kretprobed functions are present

On Tue, Mar 30, 2021 at 02:09:55PM -0500, madvenka@...ux.microsoft.com wrote:
> From: "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>
> 
> When a kretprobe is active for a function, the function's return address
> in its stack frame is modified to point to the kretprobe trampoline. When
> the function returns, the frame is popped and control is transferred
> to the trampoline. The trampoline eventually returns to the original return
> address.

Reviewed-by: Mark Brown <broonie@...nel.org>

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